The Sulu Archipelago is a chain of islands in the Pacific Ocean, in the southwestern Philippines. The archipelago forms the northern limit of the Celebes Sea and southern limit of the Sulu Sea. The Sulu Archipelago islands are within the Mindanao island group, consisting of the provinces of Basilan, Sulu, and Tawi-Tawi; hence the archipelago is sometimes referred to as Basulta, derived from the first syllables of the three provinces.

The Philippines, officially the Republic of the Philippines, is an archipelagic country in Southeast Asia. In the western Pacific Ocean, it consists of 7,641 islands, with a total area of 300,000 square kilometers, which are broadly categorized in three main geographical divisions from north to south: Luzon, Visayas, and Mindanao. The Philippines is bounded by the South China Sea to the west, the Philippine Sea to the east, and the Celebes Sea to the south. It shares maritime borders with Taiwan to the north, Japan to the northeast, Palau to the east and southeast, Indonesia to the south, Malaysia to the southwest, Vietnam to the west, and China to the northwest. It is the world's twelfth-most-populous country, with diverse ethnicities and cultures. Manila is the country's capital, and its most populated city is Quezon City. Both are within Metro Manila.